It stands for Code division multiple access.

• Users share the same carrier frequency(fc). The narrow band message signal is also multiplexed with a spreading signal of larger bandwidth. This spreading signal is pseudo noise code sequence and it has higher chip rate than rate of message.
• The main advantage is reduced level of interference. As each user is allocated an individual pseudo random codeword that is orthogonal to the codewords of the other users that the receiver end receives, tunes to receive the intended signal of the user.
• Same channel is used by several users, there may be a problem of near-far-effect. To reduce this power control is implemented at the base station.

Features:

• Self-jamming is a problem
• Soft handoff is done
• Multipath fading can be reduced as signal is spread over a large spectrum.